Molding apparatus for making dentures and plates for dental purposes



Patented June 2.4, 1930 UNITED STATES PATENTv OFFICE KARL DEHNE, OF BURGSTADT, GERMANY HOLDING APPARATUS FOR MAKING DENT'URES AND PLATES FOR DENTAL PURPOSES 'y Application -filed November 28, 1928, Serial No.

- and `plates for dental purposes. The invention Consists substantially in this, that I provide a mechanical device by means of which a pressure reservoir adapted to receive molding cylinders or the like, of various height, and its appurtenant cover are moved in opposition to each other and allowed to press against each other so that the compressed air passed into the reservoir or container, instantly acts upon a plurality of molding cylinders so that several' dentures may be-made in one single operation.

The invention will be more clearly understood by referring to the accompanying drawing in which,

Fig. 1 gives a front elevation of the molding machine, showing a cross-section of the cover and pressure reservoir,

Fig. 2 gives a side view. 1

The apparatus consists of two racks a and b in which engage two pinions c and d, which may be rotated by a hand wheel e thus imparting an up and down motion to the racks.

The upper connecting yoke of the racks carries the cover or hood f.

,lVhen the hand wheel e is suitably rotated, the racks a and b are lowered and ,thus the cover f is forced against the pressure reservoir g, in which the molding cylinders lo, Z, are to be found.

Upon the cover andthe pressure reservoir being thus -sealed together and compressed air admitted 'through the hollow standard b, into the bell-shaped space h, this air asses throughthe various holes in a per orate partition or baffle plate z', in the cavity of the bell-shaped cover to the reservoir and thus acts upon the molding cylinders lc, Z, situated therein. These cyl'- inders being filled with molten metal, the latter isl forced right' into the finest lines 322,408, and in. Germany September 17, 1928.

denture accurately impressed in every detail.

By the provision of the bell-shaped cover with the perforate partition or baille z', said cover is divided into upper and lower air chambers or compartments, the lower chamber of the cover being adaptedto receive the' upper ends .of molds which are of greater height than the mold chamber of the receptacle, so that one or more molds of varying heights may 'be accommodated for molding operations at one and the same time in the molding apparatus, and the'upper chamber of the cover communicating4 with the compressed air sup ly passage, whereby the tumbling current ol) per chamber of the cover and passing downward through the perforations in the forate baffle or partition will be checked by the baille and converted into straight vertical line. streams and pulsations or variations in the pressure of the air thus supplied to the mold receptacle prevented and the pressure rendered uniform for action on the metal in the molds.

What `I claim is:

In an air pressure apparatus for `.casting plates and duplicates thereof for.' dental purposes, the combination of a mold holdlng receptable, a stationar solid basel su port carrying said receptac e,fa pair of raciiiltoothed standards, a transverse bar con'- necting said standards at their up er' ends,

.a cover of bell shape for closin t e recepf tacle and having a perforate transverse partition dividing it interiorly into u per i and lower chambers, said cover being v xed* to said transverse bar, pinions meshing with the rack teeth of the standards for moving the same to shift the cover into/and out of sealing engagement with the recepair flowlng into the upper-' .of the mold, thus giving a firmly molded tacle, one offthe standards 'havingan air duct for feeding air under pressure to the upper. chamber of the cover for passage through the holes in the transverse partition of said cover into the receptacle whereby the whirling air current entering the upper chaJnber of the cover is converted into straight line streams on its passage throu h said partition and the flowing air there y checked and governed to secure a unifornl air pressure upon the molten metal in the molds.

In testimony whereof I affixed my signature. i

KARL DEHNE. 

